Do you have an ati card? If so try setting your PCI Express frequency to 105mhz.
Part1. Tidying Up Your BIOS (not all BIOS may have those options)
*You must update your BIOS to the latest version before proceeding*
1. Disable ‘AI Tuning’ for ASUS, ‘C.I.A.2’ for Gigabyte
2. Set PCI Express (PCIe) frequency @100Mhz (‘Auto’ for DS3/DS4/DQ6)
3. Set PCI frequency @33Mhz
4. Disable Hyperpath 3 (for P5W DH only)
5. Disable any ‘spread spectrum’
6. Disable Q-Fan (for ASUS only)
7. Disable ‘Limit CPUID Max to 3’
8. Disable any overvoltage protection
9. Disable ‘C1E’
10. Disable ‘EIST’
11. Disable Virtualization Technology
12. Disable No-Execute Memory Protect
13. Disable any other thing you don’t use
14. Do not enable any speed enhancements you see
